package controller;

import model.Blog;
import model.BlogDao;
import model.User;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * \* Created with IntelliJ IDEA.
 * \* User: Administrator
 * \* Date: 2022/6/13
 * \* Time: 9:20
 * \* To change this template use File | Settings | File Templates.
 * \* Description:
 * \
 */
@WebServlet("/blogDelete")
public class BlogDeleteServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.检查当前用户是否登录
        HttpSession session = req.getSession(false);
        if(session == null){
            resp.setContentType("text/html:charset=utf8");
            resp.getWriter().write("当前尚未登录，不能删除！");
            return;
        }
        User user = (User) session.getAttribute("user");
        if(user == null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前尚未登录，不能删除！");
            return;
        }

        //2.获取到参数中的blogId
        String blogId = req.getParameter("blogId");
        if(blogId == null || "".equals(blogId)){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("blogId参数不对！");
            return;
        }

        //3.要删除的博客信息
        BlogDao blogDao = new BlogDao();
        Blog blog = blogDao.selectOne(Integer.parseInt(blogId));
        if(blog == null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前要删除的博客不存在！");
            return;
        }

        //4.再次校验，当前的用户是否就是博客的作者
        if(user.getUserId() != blog.getUserId()){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前登录的用户不是作者，没有权限删除！");
            return;
        }

        //5.确认无误，进行删除
        blogDao.delete(Integer.parseInt(blogId));

        //6.重定向到博客列表页
        resp.sendRedirect("blog_list.html");
    }
}
